Most Routers are junk

Sorry for the slowness, I just in a Cisco RV042 router yesterday and thought it was fine, apparently it can't handle TWC traffic. :( It'll be fixed later today.  I have been having random downtimes due to...I don't really know. 

I have 4 static ip addresses on 1 server with 1 network port (I have 4 network ports, but only 1 is used).  Occassionally bursts of traffic seem to knock the busy ip address offline.  The other ip addresses work fine however.  The only way I can fix it is if I remove all but the offending static ip address, then re-add the other 3. 

I've been doing this once a week for the past year. :'(  My plan was to remove all but 1 ip address and go through the router.

Well the router isn't working, and I can't afford a beefy router.  Whats beefy? No one really talks about how much website upload traffic a router can handle, so I guess I just have to buy an expensive one and go with it. 

In the meantime, I'm rerouting all ip traffic through 1 ip address, then removing the router and going back to simple IPSec.  If anyone knows the solution or has a suggestion, email me via the contact form!